Short Answer TypeA hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?
Two bar magnets are quickly moved towards a metallic loop connected across a capacitor ‘C’ as shown in the figure. Predict the polarity of the capacitor. 
Left face of the coil will act as North Pole and right face as South Pole so as to oppose the current induced in the coil. As seen from left, the direction of the current in the coil will be anti-clockwise. 
That is, plate of the capacitor A will be positive and plate B will be negative.
Upper plate is positive and lower plate is negative.
A thin straight infinitely long conducting wire having charge density 
is enclosed by a cylindrical surface of radius r and length l, its axis coinciding with the length of the wire. Find the expression for the electric flux through the surface of the cylinder.
Plot a graph showing the variation of coulomb force (F) versus 
, where r is the distance between the two charges of each pair of charges: (1 
C, 2 
C) and (2 
C – 3 
C). Interpret the graphs obtained.
Write the expression for Lorentz magnetic force on a particle of charge ‘q’ moving with velocity v in a magnetic field B . Show that no work is done by this force on the charged particle.
OR
A steady current (I1) flows through a long straight wire. Another wire carrying steady current (I2) in the same direction is kept close and parallel to the first wire. Show with the help of a diagram how the magnetic field due to the current I1 exerts a magnetic force on the second wire. Write the expression for this force.In the given circuit, assuming point A to be at zero potential, use Kirchhoff’s rules to determine the potential at point B.
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